John Bapst High School was dedicated in September 1928 to meet the expanding needs of Roman Catholic education in the Bangor area. The co-educational school operated until 1980, when the diocese closed it due to decreasing enrollment. Since then, it has been a private school known as John Bapst Memorial High School.

In Maine, like many other states, a newly formed Ku Klux Klan organization began recruiting members in the years just before the United States entered World War I. A message of patriotism and cautions about immigrants and non-Protestants drew many thousands of members into the secret organization in the early 1920s. By the end of the decade, the group was largely gone from Maine.